PT100 temperature sensor - The perfect Sensor for industrial applications
A PT100 sensor changes its electrical resistance with every change in temperature in its environment. Its resistance value is 100 Ohms at 0°C.
This characteristic is used in a bridge circuit to generate a signal suitable for further processing. There are 5 quality classes with the following
tolerances at 0°C.
Class B: ±0.3 K
Class A: ±0.15 K
Class B 1/3: ±0.1 K*
Class B 1/5: ±0.06 K
Class B 1/10: ±0.03 K
* All HygroClip2 Advanced probes have an inbuilt PT100 Class B 1/3.
The table below illustrates the tolerances for each PT100 sensor class at different temperatures:
New standard
The manufacturing tolerances were formerly sub-divided into the accuracy Classes A and B (see above). The new standard contains
the additional classes AA and C. Within the validity range of every class for wire-wound resistors, the limit deviations (tl) are given in
dependence on the temperature (t) in Celsius:
Class AA: tl = 0.1 K + 0.0017 * t
Class A: tl = 0.15 K + 0.002 * t
Class B: tl = 0.30 K + 0.005 * t
Class C: tl = 0.6 K + 0.01 * t
Example for Class B: At 200 °C deviations in the measured value of up to ± 1.3 K are allowed.